Engineering topics

Adler, E.

Publications and source records attributed to Adler, E..

4 records

NASA NTRS1987

Regenerative fuel cell systems for mid- to high-orbit satellites

An assessment of the present and projected capabilities of selected hydrogen-oxygen and hydrogen-halogen fuel cell and electrolyzer combinations for energy storage systems (ESS) in configurations useful for spacecraft missions operating in the 10- to 50-kW range for many years in midaltitude to geosynchronous orbits has recently been completed. Results of the study indicate that regenerative fuel cell ESS are feasible for the intended application. A computer model was used to provide tradeoff analyses for optimizing the various ESS fuel cell concepts. When appropriately configured to be compatible with the mission needs of the selected model spacecraft, the specific energy for these ESS are intermediate between that presently available for nickel-hydrogen batteries and that expected for the newly emerging sodium-sulfur technology.

Taenaka, R. K.↗

NASA NTRS1984

Advanced nickel-hydrogen cell configuration study

Three nickel hydrogen battery designs, individual pressure vessel (IPV), common pressure vessel (CPV), and a bipolar battery module were studied. Weight, system complexity and cost were compared for a satellite operating in a 6 hour, 5600 nautical mile orbit. The required energy storage is 52 kWh. A 25% improvement in specific energy is observed by employing a bipolar battery versus a battery comprised of hundreds of IPV's. Further weight benefits are realized by the development of light weight technologies in the bipolar design.

Adler, E.↗

NASA NTRS1983

Advanced nickel hydrogen cell configuration study

An evaluation of the current nickel hydrogen cell design is presented. The IPV, or the Individual Pressure Vessel, is the state of the art right now. The present design, 3 1/2 inch cell, has a current limit of 50 ampere-hours. The nickel hydrogen cell design is the state of the art. Its size is 3 1/2 inches which limits it to 50 hours. The probable limits of that are probably 160 amphere IPV cell remaining in the passive cooling mode. The IPV stacks is a parallel connection of electrodes. Positive electrodes are connected with leads to the top portion of the stack and negative electrodes are connected with leads and pulled down to the bottom. So it is a combination connection of paralleling series electrostacking--parallel inside each individual stack, and series connected from one stack to the next. It offers, in the analysis, improvements in packaging, cost, energy density, and specific energy.

Adler, E.↗

NASA NTRS1983

Development of a large scale bipolar NiH2 battery

The bipolar battery concept, developed in cooperation with NASA, is described in the context of the advantages afforded by near-term IPV and CVP cell technology. The projected performance, development requirements, and a possible approach to bipolar battery design are outlined. Consideration is given to packaging electrodes within a common hydrophobic plastic frame, electrode technology that involves a photochemically etched 0.1 mm thick nickel substrate coated with a 10 mg/sq cm mixture of platinum powder and TFE30, and an electrode design that eliminates the screen and doubles the electrode thickness (from the currently used 0.8 mm) while retaining the active material loading of 1.6-1.8 gm/cu cm. Also covered are thermal management, and electrolyte and oxygen management. It is concluded that a high voltage, high capacity, bipolar NiH2 cell can be configured with proper development for use in large power systems, and that it can provide considerable weight savings.

Adler, E.↗